Arcserve 16.5 - unable to restore Public Folder Database

Arcserve 16.5 - unable to restore Public Folder Database

I´m trying to restore the public folder database to the Exchange server.

Each time i try it Arcserve Backup says: "Please specify a target on databaselevel to restore the restoredatabase"
i use the german version and i don´t know the original english error message. So i try to translate it.

Exchange is 2010, Arcsere Backup 16.5 SP1.

Source: LTO-Tape.
In german version the restore-method is called "Wiederherstellen nach Baumstruktur". It is the first option in pull-down menu.